Add, modify and remove rating scores.

Added Lua forum ratings for GMod WAYWO.
Added Useful rating.
Added Dumb rating to counter the score, might help filter out controversial posts.
Fine tuned scores to give more realistic results. Something very artistic could get kicked down by something less "programmy" for example.
Re-add funny rating.
Merge pull request #2 from FacepunchProgrammers/better_scores

Add, modify and remove rating scores.